My little 8ft x 10ft workshop has a pitched roof, and was lit with two twin tube fluorescents.
In 2020, a friend installed eight 600 x 600 LED panels in his workshop which had a flat ceiling. I was really impressed with them so decided to replace my fluorescents with a couple of panels. I fixed them beneath the rafters in wooden 'boxes' that I made. What I hadn't appreciated was that the LED panels wouldn't 'flood' the room with light in quite the same way as the fluorescents, so no light was radiated above the level of the panels. Hence, anything stored in the rafters or on top shelves was in complete darkness. The net result was that I left the panels in place, but re-installed the fluorescents, so the LED panels ended up being in addition to, rather than in place of, the fluorescents.
I've attached some rather poor quality pics of one of the panels.
First pic: The panel housing 'box'.
Second pic: The hinged LED panel in situ.
Third pic: The panel ready for use.
Fourth pic: The workshop I built from scratch in 2003, and roofed with felt shingles, which are as good today as when fitted.
Hope that's of interest.
David.